.maintenance-container, .messages-container {
    display: none;
    height: 100%;
}

.left-nav {
    width: 200px;
    background: #fff;
    border-radius: 8px;
    padding: 16px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.dropdown {
    cursor: pointer;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    position: relative;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
    z-index: 1000;
    width: calc(100% - 2px); /* 对齐父容器边框 */
    left: 0;
    top: calc(100% + 5px);
}

.dropdown-content div {
    padding: 12px 16px;
    cursor: pointer;
}

.dropdown-content div:hover {
    background-color: #f1f1f1;
}

.left-nav .option {
    cursor: pointer;
    padding: 8px;
    border-radius: 4px;
    transition: all 0.3s;
}

.left-nav .option.active {
    background: #1890ff;
    color: white;
}

.left-nav .option:hover {
    background: #e6f7ff;
}

.right-content {
    flex: 1;
    padding: 24px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    gap: 24px;
    overflow-y: auto; /* 允许垂直滚动 */
}

.right-content .horizontal-layout {
    display: flex;
    gap: 24px;
    flex-wrap: wrap; /* 允许换行 */
}
.right-content .overview {
    background: #f0f2f5; /* 更柔和的背景色 */
    border-radius: 8px;
    padding: 24px; /* 增加内边距 */
    box-shadow: 0 4px 12px rgba(0,0,0,0.1); /* 更明显的阴影 */
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #333;
    font-size: 16px;
    transition: all 0.3s;
}

.right-content .overview h3 {
    margin-bottom: 16px;
    color: #1890ff; /* 使用主题色 */
    font-weight: bold;
}

.right-content .overview:hover {
    box-shadow: 0 6px 16px rgba(0,0,0,0.2); /* 悬停时的阴影效果 */
    transform: translateY(-2px); /* 悬停时的轻微上移效果 */
}

.overview {
    background: #fff;
    border-radius: 8px;
    padding: 16px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.history-section {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.history-item {
    background: #f5f5f5;
    padding: 8px;
    border-radius: 4px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.history-item .content {
    background: #fff;
    border-radius: 4px;
    padding: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.save-btn {
    align-self: flex-end;
    padding: 12px 24px;
    background: #1890ff;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 14px;
}

.save-btn:hover {
    background: #40a9ff;
    box-shadow: 0 4px 12px rgba(24,144,255,0.4);
}